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        库存的最小值为0
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        库存：
        <button>-1000</button>
        <button>-100</button>
        <button>-10</button>
        <button>-</button>
        <span>0</span>
        <button>+</button>
        <button>+10</button>
        <button>+100</button>
        <button>+1000</button>
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